亚温淬火温度对45钢组织和性能的试验研究

Experimental Study of Intercritical Quenching on Microstructure and Mechanical Properties of 45 Steel

针对45钢淬透性低、淬火过程易出现开裂等缺陷,本文采用亚温淬火工艺对45钢进行试验研究。结果表明:在730~770℃亚温淬火时,随着淬火温度的提高,回火板条马氏体含量逐渐增多,分布趋于均匀,铁素体含量逐渐减少,硬度和抗拉强度逐渐增强。采用适当的亚温淬火工艺可有效提高45钢综合力学性能,拓宽其使用范围,为制作性能优异的零部件提供参考依据。

Aiming at the defects of low hardenability and easy cracking in quenching process of 45 steel,this paper proposes the experimental study of microstructure and mechanical properties of 45 steel by intercritical quenching.The results show that,during the intercritical quenching at 730~770℃,with the increase of the intercritical quenching temperature,the tempered lath martensite content increases gradually and the distribution tends to be uniform,the ferrite content decreases gradually,and the hardness and tensile strength increase gradually.It is concluded that appropriate intercritical quenching can effectively improve the quenching quality of 45 steel and widen the application range of the material,so as to provide reference basis for making parts with excellent performance.